Yeah, Eric Bittman at Umass Amherst is one person that reasearches circadian biology you can pick up some lingo to search for from papers. Generally speaking,

Yeah, Eric Bittman at Umass Amherst is one person that reasearches circadian biology you can pick up some lingo to search for from papers. Generally speaking, no critter's circadian cycle is 24 hours. They are all "entrained" (e.g reset) by stimuli, among which (blue) light is the most well studied. And non-24 hour circadian cycle in people can be diagnosed, and it is possible to be considerd a disability in the legal sense. But it is tricky to get testing, and insurance coverage for testing.